If you are building a Windows 7 SP1 SOE image from scratch, below are the links to Platform updates that can be included. These are not necessary for proper operation of windows but it is wise to include them if possible.
Download Dot Net Framework:
4.6.1
4.6
4.5.2
4.5.1
4.5
Download Windows Management Framework/Powershell:
4.0
5.0
Visual C++ Run-time Libraries:
2015
2013
2012 update 4
2010 SP1
2008 SP1
2005 SP1